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indie452
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I'm doing a project which involves the need to find the diffraction pattern of the sodium d lines from a sodium lamp using a telescope (focal point 3.39m) and a lens that causes the light 'rays' that hit the diffraction grating to be parallel to each other.
the diffraction grating follows the littrow condition so a=B as the input and output are along the same axis.
The diffraction grating for sodium wavelength we found the 20.37degrees for 1st order
So we have taken a ccd image of the diffraction pattern and we are getting 2 dots one above the other instead of 2 vertical lines parallel to each other
Does anyone know anything that might help us explain this?
We don't need to rotate the camera as it gave us a vertical line when we used a mirror in place of the grating to find the focal point.
the diffraction grating follows the littrow condition so a=B as the input and output are along the same axis.
The diffraction grating for sodium wavelength we found the 20.37degrees for 1st order
So we have taken a ccd image of the diffraction pattern and we are getting 2 dots one above the other instead of 2 vertical lines parallel to each other
Does anyone know anything that might help us explain this?
We don't need to rotate the camera as it gave us a vertical line when we used a mirror in place of the grating to find the focal point.